Enables storing shelf's auto_hide_behavior and alignment per display.

chrome/common/pref_names.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/pref_names.h"
 
 #include "base/basictypes.h"
 
 namespace prefs {
 
@@ skipping 2073 matching lines @@
 // gallery.
 const char kMediaGalleriesRememberedGalleries[] =
     "media_galleries.remembered_galleries";
 
 #if defined(USE_AURA)
 // |kShelfAlignment| and |kShelfAutoHideBehavior| have a local variant. The
 // local variant is not synced and is used if set. If the local variant is not
 // set its value is set from the synced value (once prefs have been
 // synced). This gives a per-machine setting that is initialized from the last
 // set value.
+// These values are default on the machine but can be overridden by per-display
+// values in kShelfPreferences.

[bartfab (slow), 2012/12/14 21:34:02]

... unless overridden by managed policy, in which case these values take
precedence again :). I think that should be noted here.

Sorry for being so nit-picky but the behavior is non-obvious and it is very
useful to document it properly.

[Jun Mukai, 2012/12/14 22:44:56]

Done.

 // String value corresponding to ash::Shell::ShelfAlignment.
 const char kShelfAlignment[] = "shelf_alignment";
 const char kShelfAlignmentLocal[] = "shelf_alignment_local";
 // String value corresponding to ash::Shell::ShelfAutoHideBehavior.
 const char kShelfAutoHideBehavior[] = "auto_hide_behavior";
 const char kShelfAutoHideBehaviorLocal[] = "auto_hide_behavior_local";
 const char kPinnedLauncherApps[] = "pinned_launcher_apps";
 // Boolean value indicating whether to show a logout button in the ash tray.
 const char kShowLogoutButtonInTray[] = "show_logout_button_in_tray";
+// Dictionary value that holds per-display preference of shelf alignment and
+// auto-hide behavior. Key of the dictionary is the id of the display, and
+// its value is a dictionary whose keys are kShelfAlignment and
+// kShelfAutoHideBehavior.
+const char kShelfPreferences[] = "shelf_preferences";
 
 const char kFlingVelocityCap[] = "gesture.fling_velocity_cap";
 const char kLongPressTimeInSeconds[] =
     "gesture.long_press_time_in_seconds";
 const char kMaxDistanceBetweenTapsForDoubleTap[] =
     "gesture.max_distance_between_taps_for_double_tap";
 const char kMaxDistanceForTwoFingerTapInPixels[] =
     "gesture.max_distance_for_two_finger_tap_in_pixels";
 const char kMaxSecondsBetweenDoubleClick[] =
     "gesture.max_seconds_between_double_click";
@@ skipping 62 matching lines @@
 // 64-bit serialization of the time last policy usage statistics were collected
 // by UMA_HISTOGRAM_ENUMERATION.
 const char kLastPolicyStatisticsUpdate[] = "policy.last_statistics_update";
 
 #if defined(OS_CHROMEOS)
 // The RLZ brand code, if enabled.
 const char kRLZBrand[] = "rlz.brand";
 #endif
 
 }  // namespace prefs